Efficient CO 2 and H 2 O Co-Electrolysis in a BaZr 0.44 Ce 0.36 Y 0.2 O 3-δ -Based Proton Ceramic Electrochemical Reactor with BaGd 0.8 La 0.2 Co 2 O 6-δ Steam Electrodes

High Resolution Image Download MS PowerPoint Slide Despite the increasing use of electrification and efforts to decarbonize processes, hydrocarbons remain indispensable for heavy transport and chemistry sectors. Electrochemical devices powered by renewable energy offer a promising strategy to convert CO 2 into sustainable molecules that can be used as fuels and chemical feedstocks. In this study, we investigate the electrochemical performance of BaGd 0.8 La 0.2 Co 2 O 6-δ as a steam or oxygen electrode in a proton ceramic electrolysis cell. Two composite materials were evaluated as electrode candidates, consisting of BaGd 0.8 La 0.2 Co 2 O 6-δ (BGLC) combined with either BaZr 0.4 Ce 0.4 Y 0.1 Yb 0.1 O 3-δ (BZCYYb4411) or BaZr 0.5 Ce 0.3 Y 0.2 O 3-δ (BZCY532). The electrodes were characterized using electrochemical impedance spectroscopy (EIS) on symmetrical cells under various oxidizing conditions and temperatures. Based on this analysis, the BGLC-BZCYYb4411 electrode was selected as the steam electrode in a full PCER configuration, composed of Ni-SrZr 0.5 Ce 0.4 Y 0.1 O 2.95 (SZCY541) as the fuel/CO 2 electrode and BaZr 0.44 Ce 0.36 Y 0.2 O 3-δ as the electrolyte. The cell was evaluated for co-electrolysis of H 2 O and CO 2 . The results illustrate the potential of the BGLC-based electrodes and BZCY-based electrolytes for efficient CO 2 upgrading and steam electrolysis in a single-step process.